JP7237159B2 - Stator, electric motor, compressor, air conditioner, stator manufacturing method, and magnetizing method - Google Patents

Description

The present invention relates to stators for electric motors.

Generally, a magnetization method is known in which a three-phase coil attached to a stator core is used to magnetize a magnetic body of a rotor. In this magnetization method, an electromagnetic force is generated when a magnetizing current flows through the three-phase coil, and this electromagnetic force may cause deformation of the three-phase coil. Therefore, in the stator disclosed in Patent Document 1, the lacing material is evenly wound around the three-phase coil in the circumferential direction in order to prevent deformation of the three-phase coil.

JP-A-11-136896

However, in the conventional technology, a large amount of lacing material is required when magnetizing the rotor with the rotor inside the stator. There is a problem that significant deformation cannot be prevented efficiently.

SUMMARY OF THE INVENTION An object of the present invention is to efficiently prevent significant deformation of the three-phase coils of the stator when magnetizing the rotor with the rotor inside the stator.

A stator according to one aspect of the present invention includes:
A stator capable of magnetizing the magnetic material of the rotor,
a stator core;
A three-phase coil attached to the stator core by distributed winding and having a first-phase coil, a second-phase coil, and a third-phase coil;
and a lacing material wound around the three-phase coil,
The first-phase coil is a coil through which the largest current flows among the three-phase coils when current flows from the power source for magnetizing the magnetic material to the three-phase coil,
At the coil ends of the three-phase coil, the first-phase coil has a first region, a second region, and a third region that are evenly divided,
The first region is located between the second region and the third region,
The lacing material is wound around the first area more than at least one of the second area and the third area.
A stator according to another aspect of the present invention includes:
A stator capable of magnetizing the magnetic material of the rotor,
a stator core;
A three-phase coil attached to the stator core by distributed winding and having a first-phase coil, a second-phase coil, and a third-phase coil;
and a lacing material wound around the three-phase coil,
When a current flows through the three-phase coil from the power source for magnetizing the magnetic material, the current flowing through the first-phase coil is the current flowing through the second-phase coil and the third-phase coil. greater than at least one of the currents,
At the coil ends of the three-phase coil, the third-phase coil has a first area, a second area, and a third area that are evenly divided,
The first region is located between the second region and the third region,
The lacing material is wound around the first area more than at least one of the second area and the third area.
An electric motor according to another aspect of the present invention includes:
the stator;
and the rotor disposed inside the stator.
A compressor according to another aspect of the present invention comprises:
a closed container;
a compression device disposed within the closed vessel;
and the electric motor that drives the compression device.
An air conditioner according to another aspect of the present invention includes
the compressor;
and a heat exchanger.
A stator manufacturing method according to another aspect of the present invention includes:
A method for manufacturing a stator having a stator core and three-phase coils attached to the stator core by distributed winding and having a first-phase coil, a second-phase coil, and a third-phase coil There is
At the coil ends of the three-phase coil, the first-phase coil has a first region, a second region, and a third region that are evenly divided,
The first region is located between the second region and the third region,
attaching the three-phase coil to the stator core by distributed winding;
At the coil end of the first phase coil, more lacing material is wound around the first region than at least one of the second region and the third region.
A magnetization method according to another aspect of the present invention comprises:
Inside a stator having a stator core and three-phase coils attached to the stator core with distributed windings and having a first phase coil, a second phase coil, and a third phase coil, A magnetization method for magnetizing a magnetic body of a rotor,
At the coil ends of the three-phase coil, the first-phase coil has a first region, a second region, and a third region that are evenly divided,
The first region is located between the second region and the third region,
At the coil end of the first phase coil, more lacing material is wound around the first region than at least one of the second region and the third region ,
arranging a rotor having the magnetic material inside the stator;
and supplying a current from a power source for magnetizing the magnetic body to the three-phase coil so that the largest current flows through the first-phase coil.

According to the present invention, significant deformation of the three-phase coils of the stator can be efficiently prevented when magnetization is performed with the rotor arranged inside the stator.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows roughly the structure of the electric motor which concerns on Embodiment 1 of this invention. FIG. 2 is a plan view schematically showing the structure of a rotor; It is a top view which shows an example of a stator. 4 is a diagram schematically showing the internal structure of the stator shown in FIG. 3; FIG. It is a schematic diagram which shows an example of the connection in a three-phase coil. FIG. 4 is a diagram showing a first region, a second region, and a third region in each first-phase coil; FIG. 4 is a diagram showing an equivalent circuit of a connection pattern of three-phase coils when magnetizing a magnetic body using a stator; 4 is a flow chart showing an example of a manufacturing process of a stator; It is a figure which shows the insertion process of an external phase coil. It is a figure which shows the insertion process of a middle phase coil. It is a figure which shows the insertion process of an internal phase coil. 4 is a flow chart showing an example of a method for magnetizing magnetic bodies of a rotor; FIG. 4 is a diagram showing another example of a stator; 14 schematically shows the internal structure of the stator shown in FIG. 13; FIG. FIG. 10 is a diagram showing an equivalent circuit of a connection pattern of three-phase coils when magnetizing a magnetic body using a stator in modification 1; FIG. 4 is a diagram showing another example of a stator; 17 schematically shows the internal structure of the stator shown in FIG. 16; FIG. FIG. 11 is a diagram showing an equivalent circuit of a connection pattern of three-phase coils when magnetizing a magnetic body using a stator in modification 2; FIG. 11 is a diagram showing an equivalent circuit of a connection pattern of three-phase coils when magnetizing a magnetic body using a stator in modification 3; FIG. 11 is a diagram showing an equivalent circuit of a connection pattern of three-phase coils when magnetizing a magnetic body using a stator in modification 4; FIG. 12 is a diagram showing an equivalent circuit of a connection pattern of three-phase coils when magnetizing a magnetic body using a stator in modification 5; FIG. 11 is a plan view showing another example of the stator; FIG. 11 is a diagram showing an equivalent circuit of a connection pattern of three-phase coils when magnetizing a magnetic body using a stator in modification 6; FIG. 20 is a diagram showing an equivalent circuit of a connection pattern of three-phase coils when magnetizing a magnetic body using a stator in modification 7; FIG. 4 is a diagram showing an example of radial electromagnetic force generated at the coil ends of a three-phase coil when the three-phase coil is energized in the manufacturing process of the stator 3, specifically, the magnetization process of the magnetic material. FIG. 4 is a diagram showing an example of axial electromagnetic force generated at coil ends of a three-phase coil when the three-phase coil is energized in the manufacturing process of the stator, specifically, the magnetization process of the magnetic material. 5 is a graph showing the difference in the magnitude of the electromagnetic force in the radial direction for each connection pattern in the three-phase coil when the coils of each phase are energized in the process of magnetizing the magnetic body. 5 is a graph showing the difference in the magnitude of the electromagnetic force in the axial direction for each connection pattern in the three-phase coil when the coils of each phase are energized in the process of magnetizing the magnetic body. 4 is a graph showing the difference in the magnitude of the electromagnetic force in the radial direction for each connection pattern in the three-phase coil when two of the three-phase coils are energized in the magnetic body magnetization process. 4 is a graph showing the difference in the magnitude of the electromagnetic force in the axial direction for each connection pattern in the three-phase coil when two of the three-phase coils are energized in the magnetic body magnetization process. FIG. 6 is a cross-sectional view schematically showing the structure of a compressor according to Embodiment 2 of the present invention; FIG. 3 is a diagram schematically showing the configuration of a refrigerating and air-conditioning apparatus according to Embodiment 3 of the present invention;

Embodiment 1.
In the xyz orthogonal coordinate system shown in each figure, the z-axis direction (z-axis) indicates a direction parallel to the axis Ax of the electric motor 1, and the x-axis direction (x-axis) is orthogonal to the z-axis direction (z-axis). The y-axis direction (y-axis) indicates a direction orthogonal to both the z-axis direction and the x-axis direction. The axis Ax is the center of the stator 3 and also the center of rotation of the rotor 2 . The direction parallel to the axis Ax is also referred to as "the axial direction of the rotor 2" or simply "the axial direction". A radial direction is a radial direction of the rotor 2 or the stator 3 and is a direction perpendicular to the axis Ax. The xy plane is a plane perpendicular to the axial direction. An arrow D1 indicates a circumferential direction about the axis Ax. The circumferential direction of the rotor 2 or stator 3 is also simply referred to as "circumferential direction".

<Structure of electric motor 1>
FIG. 1 is a plan view schematically showing the structure of electric motor 1 according to Embodiment 1 of the present invention.

The electric motor 1 has a rotor 2 having a plurality of magnetic poles, a stator 3 and a shaft 4 fixed to the rotor 2 . The electric motor 1 is, for example, a permanent magnet synchronous motor.

An air gap exists between the rotor 2 and the stator 3 . The rotor 2 rotates around the axis Ax.

FIG. 2 is a plan view schematically showing the structure of the rotor 2. FIG.
The rotor 2 is rotatably arranged inside the stator 3 . The rotor 2 has a rotor core 21 and at least one magnetic body 22 .

Rotor core 21 has a plurality of magnet insertion holes 211 and shaft holes 212 . The rotor core 21 may further have at least one flux barrier portion which is a space communicating with each magnet insertion hole 211 .

In this embodiment, rotor 2 has a plurality of magnetic bodies 22 . Each magnetic body 22 is arranged in each magnet insertion hole 211 . The shaft 4 is fixed in the shaft hole 212 .

Each magnetic body 22 provided in the electric motor 1 as a finished product is a magnetized magnetic body 22, that is, a permanent magnet. In this embodiment, one magnetic body 22 forms one magnetic pole of the rotor 2, that is, the N pole or the S pole. However, two or more magnetic bodies 22 may form one magnetic pole of the rotor 2 .

In this embodiment, one magnetic body 22 forming one magnetic pole of the rotor 2 is arranged straight in the xy plane. However, in the xy plane, a set of magnetic bodies 22 forming one magnetic pole of the rotor 2 may be arranged so as to have a V shape.

The center of each magnetic pole of the rotor 2 is located at the center of each magnetic pole of the rotor 2 (that is, the north pole or south pole of the rotor 2). Each magnetic pole of the rotor 2 (also simply referred to as “each magnetic pole” or “magnetic pole”) means an area that serves as an N pole or an S pole of the rotor 2 .

<Structure of stator 3>
The stator 3 can magnetize the magnetic bodies 22 of the rotor 2 having 2×n (n is a natural number) magnetic poles in a magnetizing process to be described later.
FIG. 3 is a plan view showing an example of the stator 3. FIG. A large current flows from the power source to the hatched coils in the magnetization process, which will be described later. For example, in the example shown in FIG. 3 , the current flowing through the middle phase coil 322 is greater than each of the current flowing through the inner phase coil 321 and the current flowing through the outer phase coil 323 .
FIG. 4 is a diagram schematically showing the internal structure of the stator 3 shown in FIG. 3. As shown in FIG.

The stator 3 has a stator core 31 , three-phase coils 32 , at least one lacing material 34 wound around the three-phase coils 32 , and varnish 36 .

The stator core 31 has multiple slots 311 in which the three-phase coils 32 are arranged. In the example shown in FIG. 3, the stator core 31 has 36 slots 311 .

The three-phase coil 32 is attached to the stator core 31 by distributed winding. As shown in FIG. 4 , the three-phase coil 32 has coil sides 32 b arranged inside the slots 311 and coil ends 32 a not arranged inside the slots 311 . Each coil end 32a is an end of the three-phase coil 32 in the axial direction.

The 3-phase coil 32 includes at least one inner-phase coil 321 , at least one middle-phase coil 322 , and at least one outer-phase coil 323 . That is, the three-phase coil 32 has a first phase, a second phase, and a third phase. For example, the first phase is the V phase, the second phase is the W phase, and the third phase is the U phase.

The three-phase coils 32 include 2×n first-phase coils, 2×n second-phase coils, and 2×n third-phase coils. In this embodiment, n=3. Therefore, in the example shown in FIG. 3 , the three-phase coil 32 has six inner-phase coils 321 , six middle-phase coils 322 and six outer-phase coils 323 . However, the number of coils for each phase is not limited to six. In this embodiment, the stator 3 has the structure shown in FIG. 3 at the two coil ends 32a. However, the stator 3 only needs to have the structure shown in FIG. 3 at one of the two coil ends 32a.

When current flows through the three-phase coil 32, the three-phase coil 32 forms 2×n magnetic poles. In this embodiment, n=3. Therefore, in the present embodiment, when current flows through the three-phase coil 32, the three-phase coil 32 forms six magnetic poles.

At the coil end 32 a of the three-phase coil 32 , the second-phase coil, the first-phase coil, and the third-phase coil of the three-phase coil 32 are arranged in this order in the circumferential direction of the stator core 31 . ing. In the example shown in FIG. 3, in the coil end 32a of the three-phase coil 32, the inner-phase coil 321, the middle-phase coil 322, and the outer-phase coil 323 of the three-phase coil 32 are arranged in the circumferential direction of the stator core 31. They are arranged in this order.

At the coil end 32 a of the three-phase coil 32 , the second-phase coil, the first-phase coil, and the third-phase coil are arranged in this order from the inner side of the stator core 31 in the radial direction of the stator core 31 . there is In the example shown in FIG. 3 , the inner phase coil 321 , middle phase coil 322 , and outer phase coil 323 are arranged in this order from the inner side of the stator core 31 in the radial direction of the stator core 31 . Therefore, in the radial direction of the stator core 31 , the middle phase coil 322 is positioned outside the inner phase coil 321 and the outer phase coil 323 is positioned outside the middle phase coil 322 at the coil end 32 a.

At the coil end 32a, each phase coil of the three-phase coil 32 has an annular shape. That is, in the example shown in FIG. 3, in the coil end 32a, six inner phase coils 321 have an annular shape, six middle phase coils 322 have an annular shape, and six external phase coils 323 have an annular shape. It has an annular shape.

In the coil end 32a, the coils of each phase of the three-phase coil 32 are arranged concentrically. That is, in the example shown in FIG. 3, in the coil end 32a, six inner phase coils 321 are arranged concentrically, six middle phase coils 322 are arranged concentrically, and six inner phase coils 322 are arranged concentrically. The external phase coils 323 are arranged concentrically.

In the coil end 32a, the coils of each phase are arranged at regular intervals in the circumferential direction. Any one phase coil is arranged in one slot 311 . Thereby, the magnetic flux of each magnetic body 22 of the rotor 2 can be effectively used.

FIG. 5 is a schematic diagram showing an example of wire connections in the three-phase coil 32. As shown in FIG.
The connection in the three-phase coil 32 is, for example, Y-connection. In other words, the three-phase coils 32 are connected by Y-connection, for example. In this case, the three-phase coil 32 has a neutral point, and the inner-phase coil 321, the middle-phase coil 322, and the outer-phase coil 323 are connected by Y-connection.

FIG. 6 is a diagram showing a first region 35a, a second region 35b, and a third region 35c in each first-phase coil.
At the coil end 32a of the three-phase coil 32, each of the 2×n first-phase coils has a first region 35a, a second region 35b, and a third region 35c that are evenly divided. . For example, as shown in FIG. 3, when the first-phase coil is the middle-phase coil 322, at the coil end 32a, each of the six middle-phase coils 322 has a first region 35a and a second region 35b. , and a third region 35c.

The first region 35a is located between the second region 35b and the third region 35c. At the coil ends 32a of the three-phase coil 32, each first-phase coil is evenly divided into a first region 35a, a second region 35b, and a third region 35c. That is, in the xy plane, each first area 35a, each second area 35b, and each third area 35c have the same area.

The lacing material 34 is, for example, a string. A varnish 36 is attached to the lacing material 34 . The lacing material 34 is thereby fixed to the three-phase coil 32 .

At each coil end 32a of each first-phase coil, the lacing material 34 is wound more around the first region 35a than at least one of the second region 35b and the third region 35c. In other words, at each coil end 32a of each first phase coil, the density of the lacing material 34 in the first region 35a is the same as the density of the lacing material 34 in the second region 35b and the density of the lacing material 34 in the third region 35c. higher than at least one of the densities of

That is, the lacing material 34 may be wound around the first area 35a more than the second area 35b, and the lacing material 34 may be wound around the first area 35a more than the third area 35c. Alternatively, the lacing material 34 may be wrapped around the first region 35a more than each of the second region 35b and the third region 35c. In other words, in each coil end 32a of each first-phase coil, the density of the lacing material 34 in the first region 35a may be higher than the density of the lacing material 34 in the second region 35b. The density of the lacing material 34 in the region 35a may be higher than the density of the lacing material 34 in the third region 35c, and the density of the lacing material 34 in the first region 35a is less than the density of the lacing material 34 in the second region 35b. and the density of the lacing material 34 in the third region 35c.

In the present embodiment, at each coil end 32a of each first-phase coil (each middle-phase coil 322 in this embodiment), the lacing material 34 is provided in each of the second region 35b and the third region 35c. more than the first region 35a. In other words, at each coil end 32a of each first-phase coil (each middle-phase coil 322 in the present embodiment), the density of the lacing material 34 in the first region 35a is the same as that in the second region 35b. 34 and the density of the lacing material 34 in the third region 35c.

As with each first-phase coil, at the coil end 32a of the three-phase coil 32, each of the 2×n second-phase coils is equally divided into first regions, second regions, and a third region. That is, in the xy plane, each first region, each second region, and each third region of each second phase coil have the same area. In this case, in each second phase coil, the first region is located between the second region and the third region.

As with each first-phase coil, at the coil end 32a of the three-phase coil 32, each of the 2×n third-phase coils is equally divided into first regions, second regions, and a third region. That is, in the xy plane, each first region, each second region, and each third region of each third-phase coil have the same area. In this case, in each third-phase coil, the first region is located between the second region and the third region.

In the example shown in FIG. 3, in the coil end 32a of the three-phase coil 32, the density of the lacing material 34 in the first region 35a of each first-phase coil is higher than each of the density of the lacing material 34 and the density of the lacing material 34 in the first region of each third phase coil. As a result, in the step of magnetizing the magnetic body 22 to be described later, it is possible to prevent significant deformation of the first-phase coil through which the largest current flows among the three-phase coils 32 .

FIG. 7 is a diagram showing an equivalent circuit of the connection pattern of the three-phase coil 32 when the magnetic body 22 is magnetized using the stator 3. As shown in FIG. In other words, FIG. 7 is a diagram showing an example of the connection state between the three-phase coil 32 connected by Y-connection and the power supply for magnetization. The arrows shown in FIG. 7 indicate the direction of current flow. A power source for magnetizing the magnetic body 22 is also simply referred to as a “power source”. In this embodiment, the power source is a DC power source.

<Y-connection/3-phase energization/connection pattern P1>
In the example shown in FIG. 7, when current flows from the power supply for magnetization to the three-phase coil 32, the positive side of the power supply (that is, the positive pole side of the power supply) is connected to the middle phase coil 322, and the power supply is connected to the inner phase coil 321 and the outer phase coil 323 . The connection state shown in FIG. 7 is called a connection pattern P1. An energization method in which a current flows through each phase coil when a current flows from the magnetizing power source to the three-phase coil 32 is referred to as "three-phase energization".

The circuit diagram shown in FIG. 7 is an equivalent circuit diagram, but in the actual magnetization process, when current flows from the power source for magnetization to the three-phase coil 32, 2×n first-phase coils are connected to the positive or negative side of the power supply. In the connection pattern P1, the first-phase coil is the coil through which the largest current flows among the three-phase coils 32 when current flows from the magnetizing power source to the three-phase coils 32 .

In the connection pattern P1, in the magnetization process, when a current flows from the power source for magnetization to the three-phase coil 32, the current flowing through each of the first-phase coils is greater than the current flowing through each of the second-phase coils. is also larger than the current flowing through each of the third phase coils. That is, in the magnetizing process, when current flows from the magnetizing power supply to the three-phase coil 32, the current flowing in each of the first-phase coils is larger than the current flowing in each of the second-phase coils. Also, the current flowing through each of the first phase coils may be greater than the current flowing through each of the third phase coils, and the current flowing through each of the first phase coils may be greater than the current flowing through each of the second phase coils. It may be larger than both the current flowing through each and the current flowing through each of the third phase coils.

In the wiring pattern P1, the current flowing from the magnetizing power supply to the first phase coil is divided into the current flowing to the second phase coil and the current flowing to the third phase coil. That is, in the connection pattern P<b>1 , a large current flows from the power supply to the intermediate phase coil 322 . The current that flows from the power source to the middle phase coil 322 is divided into the current that flows to the inner phase coil 321 and the current that flows to the outer phase coil 323 . Therefore, the current flowing through the middle-phase coil 322 is larger than each of the current flowing through the inner-phase coil 321 and the current flowing through the outer-phase coil 323 .

<Manufacturing method of stator 3>
An example of a method for manufacturing the stator 3 will be described.
FIG. 8 is a flow chart showing an example of the manufacturing process of the stator 3. As shown in FIG.

FIG. 9 is a diagram showing the process of inserting the external phase coil 323 in step S11.
In step S11, as shown in FIG. 9, the external phase coil 323 is attached to the prefabricated stator core 31 by distributed winding. Specifically, the external phase coil 323 is inserted into the slot 311 of the stator core 31 with an insertion tool.

FIG. 10 is a diagram showing the process of inserting the middle phase coil 322 in step S12.
In step S12, as shown in FIG. 10, the middle phase coil 322 is attached to the stator core 31 by distributed winding. Specifically, the intermediate phase coil 322 is inserted into the slot 311 of the stator core 31 with an inserting tool.

FIG. 11 is a diagram showing the process of inserting the internal phase coil 321 in step S13.
In step S13, as shown in FIG. 11, the inner phase coil 321 is attached to the stator core 31 by distributed winding. Specifically, the inner phase coil 321 is inserted into the slot 311 of the stator core 31 with an insertion tool.

From step S11 to step S13, at each coil end 32a of the three-phase coil 32, three phase coils 322, 321, and 323 are arranged in this order in the circumferential direction of the stator core 31. A phase coil 32 is attached to the stator core 31 by distributed winding.

In other words, from step S11 to step S13, at each coil end 32a of the three-phase coil 32, the inner-phase coil 321, the middle-phase coil 322, and the outer-phase coil 323 are positioned inside the stator core 31 in the radial direction of the stator core 31. The three-phase coils 32 are attached to the stator core 31 by distributed winding so that they are arranged in this order.

As a result, from step S11 to step S13, in each coil end 32a of the three-phase coil 32, in the radial direction of the stator core 31, the middle-phase coil 322 is positioned outside the inner-phase coil 321, and the outer-phase coil 323 is positioned in the middle. A three-phase coil 32 is attached to the stator core 31 so as to be positioned outside the phase coils 322 .

In step S14, the inner phase coil 321, the middle phase coil 322, and the outer phase coil 323 are connected. For example, the inner phase coil 321, the middle phase coil 322, and the outer phase coil 323 are connected by Y connection or delta connection. In this embodiment, the inner phase coil 321, the middle phase coil 322, and the outer phase coil 323 are connected by Y connection. Furthermore, the shape of the connected three-phase coil 32 is arranged.

In step S<b>15 , the lacing material 34 is attached to the three-phase coil 32 . In this embodiment, the lacing material 34 is wound around the three-phase coil 32 as shown in FIGS.

For example, the lacing material 34 is wound around the inner phase coil 321 and the middle phase coil 322 . Thereby, the inner phase coil 321 and the middle phase coil 322 are fastened with the lacing material 34 .

Similarly, the lacing material 34 is wound around the middle phase coil 322 and the outer phase coil 323 . Thereby, the middle phase coil 322 and the outer phase coil 323 are fastened with the lacing material 34 .

Furthermore, the lacing material 34 may be wound around the inner phase coil 321 , the middle phase coil 322 and the outer phase coil 323 . Thereby, the inner phase coil 321 , the middle phase coil 322 and the outer phase coil 323 are fastened with the lacing material 34 .

In step S15, at each coil end 32a of each first phase coil, more lacing material 34 is wound around the first region 35a than at least one of the second region 35b and the third region 35c. In other words, at each coil end 32a of each first-phase coil, the density of the lacing material 34 in the first region 35a is the same as the density of the lacing material 34 in the second region 35b and the density of the lacing material 34 in the third region 35c. A lacing material 34 is wound around the three-phase coil 32 so as to be higher than at least one of the densities.

In the present embodiment, at each coil end 32a of each first-phase coil (each middle-phase coil 322 in this embodiment), the lacing material 34 is provided in each of the second region 35b and the third region 35c. more than the first region 35a. In other words, at each coil end 32a of each first-phase coil (each middle-phase coil 322 in the present embodiment), the density of the lacing material 34 in the first region 35a is higher than the density of the lacing material 34 in the second region 35b. and the density of the lacing material 34 in the third region 35c.

In step S<b>16 , varnish 36 is applied to the lacing material 34 . For example, the lacing material 34 is impregnated with the varnish 36 .

At each coil end 32a of each first-phase coil (each middle-phase coil 322 in this embodiment), the lacing material 34 is more in the first region than in each of the second region 35b and the third region 35c. Since the area 35a is wound, the amount of varnish 36 adhering to the lacing material 34 in the first area 35a is the same as the amount of varnish adhering to the lacing material 34 in the second area 35b and the amount of varnish adhering to the lacing material 34 in the third area 35c. than each of the amounts of varnish adhering to the lacing material 34 in . This enhances the holding power of the lacing material 34 in the first region 35a. As a result, each first-phase coil (in this embodiment, each middle-phase coil 322) can be firmly fixed, and the amount of varnish 36 on the stator 3 can be reduced compared to the conventional technique. .

In step S17, the varnish 36 attached to the lacing material 34 is cured. For example, when the varnish 36 adhered to the lacing material 34 is heated with a heater, the varnish 36 is cured. As a result, the three-phase coil 32 is fixed with the lacing material 34, and the stator 3 shown in FIG. 3 is obtained.

<Method of magnetizing magnetic body 22 of rotor 2 using stator 3>
A method of magnetizing the magnetic bodies 22 of the rotor 2 using the stator 3 will be described.
FIG. 12 is a flow chart showing an example of a method for magnetizing the magnetic bodies 22 of the rotor 2. As shown in FIG.

At step S21, the stator 3 is fixed. For example, the stator 3 is fixed in the compressor or electric motor by a fixing method such as press fitting or shrink fitting.

In step S22, the rotor is arranged inside the stator 3. As shown in FIG. At least one magnetic body 22 is attached to the rotor.

In step S23, the three-phase coil 32 is connected to the power supply for magnetization. For example, the first phase coil is connected to the plus side or minus side of the power supply. The connection between the three-phase coil 32 and the power supply is, for example, the wiring pattern P1 described above. The connection between the three-phase coil 32 and the power supply may be any one of the connection patterns P2 to P8 in the modifications described later.

In step S24, the position of the rotor 2 having at least one magnetic body 22 (specifically, the phase of the rotor 2) is fixed with a jig.

Step S25 is a step of magnetizing the magnetic body 22 (simply referred to as a "magnetizing step"). At step S25, the magnetic body 22 is magnetized. Specifically, current is supplied from the power supply to the three-phase coil 32 so that the largest current flows through the first-phase coil.

In the connection pattern P1, a large current flows through the middle phase coil 322 from the power supply. The current that flows from the power source to the middle phase coil 322 is divided into the current that flows to the inner phase coil 321 and the current that flows to the outer phase coil 323 . Therefore, the current flowing through the middle-phase coil 322 is larger than each of the current flowing through the inner-phase coil 321 and the current flowing through the outer-phase coil 323 .

A magnetic field is generated by the current flowing from the power supply to the three-phase coil 32, and the magnetic material 22 of the rotor 2 is magnetized. As a result, the magnetic body 22 becomes a permanent magnet.

At step S26, the jig used at step S24 is removed from the rotor.

Other examples of the stator 3, that is, modified examples 1 to 7, will be described below with respect to points different from those described in the first embodiment.

Modification 1. <Y connection, 3-phase energization, connection pattern P2>
FIG. 13 is a diagram showing another example of the stator 3. FIG.
14 is a diagram schematically showing the internal structure of the stator 3 shown in FIG. 13. FIG.
In the stator 3 shown in FIGS. 13 and 14 (hereinafter also referred to as modification 1), the first phase coil is the inner phase coil 321, the second phase coil is the middle phase coil 322, and the third A phase coil is an external phase coil 323 .

That is, in Modification 1, at the coil end 32 a of the three-phase coil 32 , the first-phase coil, the second-phase coil, and the third-phase coil of the three-phase coil 32 are connected to the stator core 31 . They are arranged in this order in the circumferential direction, and the first-phase coils, the second-phase coils, and the third-phase coils are arranged in this order from the inner side of the stator core 31 in the radial direction of the stator core 31. there is

FIG. 15 is a diagram showing an equivalent circuit of the connection pattern of the three-phase coil 32 when the magnetic body 22 is magnetized using the stator 3 in Modification 1. As shown in FIG. In other words, FIG. 15 is a diagram showing an example of the connection state between the three-phase coil 32 connected by Y-connection and the power supply for magnetization in Modification 1. As shown in FIG. The arrows shown in FIG. 15 indicate the direction of current flow.

In the example shown in FIG. 15, when current flows from the magnetizing power supply to the three-phase coil 32, the positive side of the power supply (that is, the positive pole side of the power supply) is connected to the inner phase coil 321, and the power supply is connected to the middle phase coil 322 and the outer phase coil 323 . The connection state shown in FIG. 15 is called a connection pattern P2.

The circuit diagram shown in FIG. 15 is an equivalent circuit diagram, but in the actual magnetization process, when current flows from the power source for magnetization to the three-phase coil 32, 2×n first-phase coils are connected to the positive or negative side of the power supply.

In the connection pattern P2, a large current flows through the inner phase coil 321 from the power supply. The current that flows from the power supply to the inner phase coil 321 is divided into the current that flows to the middle phase coil 322 and the current that flows to the outer phase coil 323 . Therefore, the current flowing through the inner phase coil 321 is larger than each of the current flowing through the middle phase coil 322 and the current flowing through the outer phase coil 323 .

In Modification 1, the first-phase coil is the coil through which the largest current flows among the three-phase coils 32 when current flows from the power source for magnetization to the three-phase coil 32 .

In Modified Example 1, in the coil end 32a of the three-phase coil 32, the density of the lacing material 34 in the first region 35a of each first-phase coil is the same as the density of the lacing material 34 in the first region 35a of each second-phase coil. and the density of the lacing material 34 in the first region of each third phase coil. As a result, in the process of magnetizing the magnetic body 22, the first-phase coil through which the largest current flows among the three-phase coils 32 can be prevented from being significantly deformed.

Modification 2. <Y-connection/2-phase energization/connection pattern P3>
FIG. 16 is a diagram showing another example of the stator 3. FIG.
17 is a diagram schematically showing the internal structure of the stator 3 shown in FIG. 16. FIG.
In the stator 3 shown in FIGS. 16 and 17 (hereinafter also referred to as modified example 2), the first-phase coil is the inner-phase coil 321, the second-phase coil is the outer-phase coil 323, and the third-phase coil is is the middle phase coil 322 .

In this case, at the coil end 32 a of the three-phase coil 32 , the first-phase coil, the third-phase coil, and the second-phase coil of the three-phase coil 32 are arranged in this direction in the circumferential direction of the stator core 31 . The first-phase coils, the third-phase coils, and the second-phase coils are arranged in this order from the inner side of the stator core 31 in the radial direction of the stator core 31 .

However, in Modification 2, the first phase coil may be the external phase coil 323 . In this case, the inner phase coil 321 is, for example, a second phase coil.

In Modified Example 2, each internal phase coil 321 has a first region 35a, a second region 35b, and a third region 35c, and each external phase coil 323 also has a first region 35a, a second region 35b, and a third region 35c.

At each coil end 32a, more lacing material 34 is wound around the first region 35a than at least one of the second region 35b and the third region 35c. In other words, in each coil end 32a, the density of the lacing material 34 in the first region 35a is higher than at least one of the density of the lacing material 34 in the second region 35b and the density of the lacing material 34 in the third region 35c. expensive.

In the example shown in FIG. 16, at each coil end 32a, more lacing material 34 is wound around the first region 35a than around the second region 35b. In other words, in each coil end 32a, the density of the lacing material 34 in the first region 35a is higher than the density of the lacing material 34 in the second region 35b.

FIG. 18 is a diagram showing an equivalent circuit of the connection pattern of the three-phase coil 32 when the magnetic body 22 is magnetized using the stator 3 in Modification 2. As shown in FIG. In other words, FIG. 18 is a diagram showing an example of the connection state between the three-phase coil 32 connected by Y-connection and the power supply for magnetization in Modification 2. As shown in FIG. The arrows shown in FIG. 18 indicate the direction of current flow.

In the example shown in FIG. 18, when current flows from the magnetizing power source to the three-phase coil 32, the positive side of the power source is connected to the inner phase coil 321 and the negative side of the power source is connected to the outer phase coil 323. there is One end of the intermediate phase coil 322 is connected to a neutral point, and the other end is an open end. The connection state shown in FIG. 18 is called a connection pattern P3. An energization method in which current flows through two of the three phases when current flows from the power source for magnetization to the three-phase coil 32 is referred to as "two-phase energization."

In the connection pattern P3, the current that flows from the magnetizing power supply to the first-phase coil flows through the second-phase coil and does not flow through the third-phase coil. In the present embodiment, a large current flows through the inner phase coil 321 and the outer phase coil 323 from the power supply. A current that flows from the power source to the inner phase coil 321 flows to the outer phase coil 323 and does not flow to the middle phase coil 322 .

In Modified Example 2, the first-phase coil and the second-phase coil are the coils through which the largest current flows among the three-phase coils 32 when current flows from the magnetizing power supply to the three-phase coils 32. .

In Modified Example 2, the density of the lacing material 34 in the first region 35a of each first-phase coil is higher than the density of the lacing material 34 in the first region of each third-phase coil, and the density of the lacing material 34 in each first-phase coil is The density of the lacing material 34 in the first region 35a of each third phase coil is higher than the density of the lacing material 34 in the first region of each third phase coil. As a result, in the process of magnetizing the magnetic body 22, the largest current among the three-phase coils 32 flows through the first-phase coil and the second-phase coil. significant deformation of the coil of the second phase and the coil of the second phase can be prevented.

Modification 3. <Delta connection/3-phase energization/connection pattern P4>
In modification 3, the structure of the stator 3 is the same as the structure of the stator 3 shown in FIGS. is different from the wiring pattern P1 shown in FIG.

In modification 3, the connection in the three-phase coil 32 is delta connection. In other words, the three-phase coils 32 are connected by delta connection. In this case, the inner phase coil 321, the middle phase coil 322, and the outer phase coil 323 are connected by delta connection.

FIG. 19 is a diagram showing an equivalent circuit of the connection pattern of the three-phase coil 32 when the magnetic body 22 is magnetized using the stator 3 in Modification 3. As shown in FIG. In other words, FIG. 19 is a diagram showing an example of the connection state between the three-phase coil 32 connected by delta connection and the power supply for magnetization in Modification 3. As shown in FIG. The arrows shown in FIG. 19 indicate the direction of current flow.

In the example shown in FIG. 19, when current flows from the magnetizing power source to the three-phase coil 32, the positive side of the power source is connected to the middle phase coil 322 and the outer phase coil 323, and the negative side of the power source is connected to the inner phase coil. 321 and the middle phase coil 322 . The connection state shown in FIG. 19 is called a connection pattern P4.

In the connection pattern P4, current flows through the inner phase coil 321, the middle phase coil 322, and the outer phase coil 323 from the power source. Since the external phase coil 323 and the internal phase coil 321 are connected in series, the electrical resistance value from the external phase coil 323 to the internal phase coil 321 is greater than the electrical resistance value of the intermediate phase coil 322 . Therefore, the current flowing through the outer-phase coil 323 and the inner-phase coil 321 is smaller than the current flowing through the middle-phase coil 322, and the current flowing through the middle-phase coil 322 is equal to the current flowing through the outer-phase coil 323 and the current flowing through the inner-phase coil 321. larger than each other.

In Modification 3, the first-phase coil is the coil through which the largest current flows among the three-phase coils 32 when current flows from the magnetizing power supply to the three-phase coil 32 .

In Modified Example 3, at the coil end 32a of the three-phase coil 32, the density of the lacing material 34 in the first region 35a of each first-phase coil is the same as the density of the lacing material 34 in the first region 35a of each second-phase coil. and the density of the lacing material 34 in the first region of each third phase coil. As a result, in the process of magnetizing the magnetic body 22, the first-phase coil through which the largest current flows among the three-phase coils 32 can be prevented from being significantly deformed.

Modification 4. <Delta connection/3-phase energization/connection pattern P5>
In Modification 4, the structure of the stator 3 is the same as the structure of Modification 1 shown in FIGS. is different from the wiring pattern P2 in the first modification.

In modification 4, the connection in the three-phase coil 32 is delta connection. In other words, the three-phase coils 32 are connected by delta connection. In this case, the inner phase coil 321, the middle phase coil 322, and the outer phase coil 323 are connected by delta connection.

FIG. 20 is a diagram showing an equivalent circuit of the connection pattern of the three-phase coil 32 when the magnetic body 22 is magnetized using the stator 3 in Modification 4. As shown in FIG. In other words, FIG. 20 is a diagram showing an example of the connection state between the three-phase coil 32 connected by delta connection and the power supply for magnetization in Modification 4. In FIG. The arrows shown in FIG. 20 indicate the direction of current flow.

In the example shown in FIG. 20, when current flows from the magnetizing power source to the three-phase coil 32, the positive side of the power source is connected to the middle phase coil 322 and the inner phase coil 321, and the negative side of the power source is connected to the inner phase coil. It is connected to the coil 321 and the external phase coil 323 . The connection state shown in FIG. 20 is called a connection pattern P5.

In the connection pattern P5, current flows through the inner phase coil 321, the middle phase coil 322, and the outer phase coil 323 from the power source. Since the middle-phase coil 322 and the outer-phase coil 323 are connected in series, the electric resistance value from the middle-phase coil 322 to the outer-phase coil 323 is higher than the electric resistance value of the inner-phase coil 321 . Therefore, the current flowing through the middle-phase coil 322 and the outer-phase coil 323 is smaller than the current flowing through the inner-phase coil 321, and the current flowing through the inner-phase coil 321 is larger than the current flowing through the middle-phase coil 322 and the current flowing through the outer-phase coil 323. larger than each other.

In Modification 4, the first-phase coil is the coil through which the largest current flows among the three-phase coils 32 when current flows from the power source for magnetization to the three-phase coil 32 .

In Modified Example 4, at the coil end 32a of the three-phase coil 32, the density of the lacing material 34 in the first region 35a of each first-phase coil is the same as the density of the lacing material 34 in the first region 35a of each second-phase coil. and the density of the lacing material 34 in the first region of each third phase coil. As a result, in the process of magnetizing the magnetic body 22, the first-phase coil through which the largest current flows among the three-phase coils 32 can be prevented from being significantly deformed.

Modification 5. <Delta connection/two-phase energization/connection pattern P6>
In Modified Example 5, the structure of the stator 3 is the same as the structure of Modified Example 2 shown in FIGS. is different from the wiring pattern P3 in the second modification.

In modification 5, the connection in the three-phase coil 32 is delta connection. In other words, the three-phase coils 32 are connected by delta connection. In this case, the inner phase coil 321, the middle phase coil 322, and the outer phase coil 323 are connected by delta connection.

FIG. 21 is a diagram showing an equivalent circuit of the connection pattern of the three-phase coil 32 when the magnetic body 22 is magnetized using the stator 3 in Modification 5. As shown in FIG. In other words, FIG. 21 is a diagram showing an example of the connection state between the three-phase coil 32 connected by delta connection and the power supply for magnetization in Modification 5. As shown in FIG. The arrows shown in FIG. 21 indicate the direction of current flow.

In the example shown in FIG. 21, when current flows from the magnetizing power supply to the three-phase coil 32, the plus side of the power supply is connected to the outer phase coil 323, the middle phase coil 322, and the inner phase coil 321, The minus side of the power supply is connected to the inner phase coil 321 and the outer phase coil 323 . The connection state shown in FIG. 21 is called a connection pattern P6.

In the wiring pattern P6, current flows from the power source to the inner phase coil 321 and the outer phase coil 323, and current does not flow to the middle phase coil 322. Therefore, a large current flows through the inner phase coil 321 and the outer phase coil 323 .

In Modified Example 5, the first-phase coil and the second-phase coil are the coils through which the largest current flows among the three-phase coils 32 when current flows from the magnetizing power supply to the three-phase coils 32. .

In Modified Example 5, the density of the lacing material 34 in the first region 35a of each first-phase coil is higher than the density of the lacing material 34 in the first region of each third-phase coil, and the density of the lacing material 34 in each first-phase coil is The density of the lacing material 34 in the first region 35a of each third phase coil is higher than the density of the lacing material 34 in the first region of each third phase coil. As a result, in the process of magnetizing the magnetic body 22, the largest current among the three-phase coils 32 flows through the first-phase coil and the second-phase coil. significant deformation of the coil of the second phase and the coil of the second phase can be prevented.

Modification 6. <Y connection/three-phase energization/connection pattern P7>
FIG. 22 is a plan view showing another example of the stator 3. FIG.
In Modified Example 6, the first phase coil is the outer phase coil 323 , the second phase coil is the middle phase coil 322 , and the third phase coil is the inner phase coil 321 .

That is, in Modification 6, at the coil end 32 a of the three-phase coil 32 , the third-phase coil, the second-phase coil, and the first-phase coil of the three-phase coil 32 are connected to the stator core 31 . They are arranged in this order in the circumferential direction, and the third-phase coils, the second-phase coils, and the first-phase coils are arranged in this order from the inner side of the stator core 31 in the radial direction of the stator core 31. there is

FIG. 23 is a diagram showing an equivalent circuit of the connection pattern of the three-phase coil 32 when the magnetic body 22 is magnetized using the stator 3 in the sixth modification. In other words, FIG. 23 is a diagram showing an example of the connection state between the three-phase coil 32 connected by Y-connection and the power supply for magnetization in the sixth modification. The arrows shown in FIG. 23 indicate the direction of current flow.

In the example shown in FIG. 23, when current flows from the magnetizing power source to the three-phase coil 32, the positive side of the power source is connected to the inner phase coil 321 and the middle phase coil 322, and the negative side of the power source is connected to the outer phase coil. H.323 is connected. The connection state shown in FIG. 23 is called a connection pattern P7.

In the connection pattern P7, the current from the power supply is divided into a current flowing through the inner phase coil 321 and a current flowing through the middle phase coil 322, and these currents flow through the outer phase coil 323. Therefore, the current flowing through the outer phase coil 323 is larger than each of the current flowing through the inner phase coil 321 and the current flowing through the middle phase coil 322 .

In Modified Example 6, the first-phase coil is the coil through which the largest current flows among the three-phase coils 32 when current flows from the power supply for magnetization to the three-phase coil 32 .

In Modified Example 6, in the coil end 32a of the three-phase coil 32, the density of the lacing material 34 in the first region 35a of each first-phase coil is the same as the density of the lacing material 34 in the first region of each second-phase coil. and the density of the lacing material 34 in the first region of each third phase coil. As a result, in the process of magnetizing the magnetic body 22, the first-phase coil through which the largest current flows among the three-phase coils 32 can be prevented from being significantly deformed.

Modification 7. <Delta connection/3-phase energization/connection pattern P8>
In Modified Example 7, the structure of the stator 3 is the same as the structure of the stator 3 shown in FIG. is different from the connection pattern P7 shown in FIG.

In modification 7, the connection in the three-phase coil 32 is delta connection. In other words, the three-phase coils 32 are connected by delta connection. In this case, the inner phase coil 321, the middle phase coil 322, and the outer phase coil 323 are connected by delta connection.

FIG. 24 is a diagram showing an equivalent circuit of the connection pattern of the three-phase coil 32 when the magnetic body 22 is magnetized using the stator 3 in the seventh modification. In other words, FIG. 24 is a diagram showing an example of the connection state between the three-phase coil 32 connected by delta connection and the power supply for magnetization in Modification 7. In FIG. The arrows shown in FIG. 24 indicate the direction of current flow.

In the example shown in FIG. 24, when current flows from the magnetizing power source to the three-phase coil 32, the positive side of the power source is connected to the middle phase coil 322 and the outer phase coil 323, and the negative side of the power source is connected to the inner phase coil. 321 and the external phase coil 323 . The connection state shown in FIG. 24 is called a connection pattern P8.

In the connection pattern P8, the current flowing through the outer-phase coil 323 is larger than each of the current flowing through the inner-phase coil 321 and the current flowing through the intermediate-phase coil 322 .

In Modified Example 7, the first-phase coil is the coil through which the largest current flows among the three-phase coils 32 when current flows from the power supply for magnetization to the three-phase coil 32 .

In Modified Example 7, at the coil end 32a of the three-phase coil 32, the density of the lacing material 34 in the first region of each first-phase coil is equal to that of the lacing material 34 in the first region of each second-phase coil. higher than each of the density and the density of the lacing material 34 in the first region of each third phase coil. As a result, in the process of magnetizing the magnetic body 22, the first-phase coil through which the largest current flows among the three-phase coils 32 can be prevented from being significantly deformed.

<Advantages of the stator 3>
Advantages of the stator 3 will be described.
FIG. 25 shows an electromagnetic force F1 in the radial direction generated at the coil end 32a of the three-phase coil 32 when the three-phase coil 32 is energized in the manufacturing process of the stator 3, specifically, the magnetization process of the magnetic body 22. It is a figure which shows the example of. In FIG. 25, the arrows in the 3-phase coil 32 indicate the directions of the currents.

In the example shown in FIG. 25, when a current flows through the three-phase coil 32 from the power source for magnetization, a radial electromagnetic force F1 repulsive to each other is generated between the middle-phase coil 322 and the outer-phase coil 323 . This electromagnetic force F1 is also called Lorentz force.

FIG. 26 shows an axial electromagnetic force F2 generated in the coil end 32a of the three-phase coil 32 when the three-phase coil 32 is energized in the manufacturing process of the stator 3, specifically, the magnetization process of the magnetic body 22. It is a figure which shows the example of.

When a current flows through a curved path such as the coil end 32a, there is a difference in the magnetic flux density generated by the current between the inside and the outside of the curved portion, and the three-phase coil 32 is arranged so that these magnetic flux densities are uniform. force is generated. As a result, a force is generated in the coil end 32a to linearly deform the coil end 32a. Since both ends of the coil end 32a of each phase coil are fixed to the stator core 31, force acts on the coil end 32a in the axial direction. Therefore, when a current flows through the three-phase coil 32 from the power source for magnetization, an electromagnetic force F2 is generated in the three-phase coil 32 in the axial direction, as shown in FIG.

FIG. 27 is a graph showing the difference in the magnitude of the electromagnetic force F1 in the radial direction for each connection pattern in the three-phase coil 32 when the coils of each phase are energized in the process of magnetizing the magnetic body 22 . That is, FIG. 27 is a graph showing the difference in magnitude of the electromagnetic force F1 in the radial direction generated when magnetizing the magnetic body 22 by three-phase energization in the magnetizing process. The data shown in FIG. 27 are the results of electromagnetic field analysis.

In FIG. 27, connection patterns P1 and P2 correspond to the connection patterns shown in FIGS. 7 and 15, respectively. The connection pattern Ex1 is a comparative example. In the connection pattern Ex1, in the three-phase coil 32 connected by Y connection, the external phase coil 323 is connected to the positive side of the power supply for magnetization, and the internal phase coil 321 and the intermediate phase coil 322 are connected to the negative side of the power supply. It is connected. A large current flows through the external phase coil 323 in the connection pattern Ex1.

In the connection pattern Ex1, a large current flows from the magnetizing power supply to the external phase coil 323, and the electromagnetic force F1 generated in the external phase coil 323 is larger than that of the connection patterns P1 and P2. In this case, the external phase coil 323 is easily deformed in the radial direction. As a result, for example, when the electric motor 1 is applied to a compressor, the external phase coils 323 come close to metal parts (for example, the closed container of the compressor), making it difficult to ensure the electrical insulation of the external phase coils 323 .

On the other hand, in the connection patterns P1 and P2, the electromagnetic force F1 generated in the external phase coil 323 is smaller than in the connection pattern Ex1. Therefore, when magnetization is performed with the rotor 2 arranged inside the stator 3, significant deformation of the three-phase coils 32, particularly the external-phase coils 323 can be prevented. As a result, deformation of the external phase coil 323 is suppressed, so that electrical insulation of the external phase coil 323 can be ensured.

FIG. 28 is a graph showing the difference in the magnitude of the electromagnetic force F2 in the axial direction for each connection pattern in the three-phase coil 32 when the coils of each phase are energized in the process of magnetizing the magnetic body 22 . That is, FIG. 28 is a graph showing the difference in the magnitude of the electromagnetic force F2 in the axial direction generated when magnetizing the magnetic body 22 by three-phase energization in the magnetizing process. In FIG. 28, connection patterns Ex1, P1, P2 correspond to connection patterns Ex1, P1, P2 in FIG. 27, respectively.

As shown in FIG. 28, regarding the electromagnetic force F2 in the axial direction, a large axial electromagnetic force F2 is generated in one of the three-phase coils 32 regardless of the wiring pattern. Specifically, in the connection pattern Ex1, a large current flows from the power supply to the external phase coil 323, and a large electromagnetic force F2 is generated in the external phase coil 323 in the axial direction. In the connection pattern P1, a large current flows through the middle phase coil 322 from the power supply, and a large electromagnetic force F2 is generated in the middle phase coil 322 in the axial direction. In the connection pattern P2, a large current flows from the power supply to the inner phase coil 321, and a large electromagnetic force F2 is generated in the inner phase coil 321 in the axial direction.

As described above, in the process of magnetizing the magnetic body 22, considering the electromagnetic force F1 in the radial direction, the three-phase coil 32 is desirably connected in the connection pattern P1 or P2. However, in the connection pattern P1 or P2, the electromagnetic force F2 of the first-phase coil connected to the positive side of the power supply for magnetization is large. In particular, the central portion of the first-phase coil, that is, the first region 35a, is likely to be greatly deformed.

Therefore, at each coil end 32a of each first-phase coil, more lacing material 34 is wound around the first region 35a than at least one of the second region 35b and the third region 35c. In other words, at each coil end 32a of each first phase coil, the density of the lacing material 34 in the first region 35a is the same as the density of the lacing material 34 in the second region 35b and the density of the lacing material 34 in the third region 35c. higher than at least one of the densities of In the connection pattern P1, the first-phase coil is the middle-phase coil 322, and in the connection pattern P2, the first-phase coil is the inner-phase coil 321.

As a result, the lacing material 34 can prevent significant deformation of the first-phase coil when magnetization is performed with the rotor 2 arranged inside the stator 3 in the connection pattern P1 or P2.

Therefore, since deformation of the three-phase coil 323 is suppressed, the performance of the electric motor 1, for example, the electrical insulation of the three-phase coil 32 can be ensured.

Furthermore, at each coil end 32a of each first-phase coil, the lacing material 34 should be wound more around the first region 35a than at least one of the second region 35b and the third region 35c. , the number of lacing materials 34 can be reduced, and the cost of the stator 3 can be reduced. Thereby, significant deformation of the three-phase coil 32 can be efficiently prevented.

The amount of varnish 36 adhering to the lacing material 34 in the first region 35a is the amount of varnish adhering to the lacing material 34 in the second region 35b and the amount of varnish adhering to the lacing material 34 in the third region 35c. at least one of the amounts of varnish applied. This enhances the holding power of the lacing material 34 in the first region 35a. As a result, the coils of each first phase can be firmly fixed, and the amount of varnish 36 on the stator 3 can be reduced compared to the prior art.

FIG. 29 shows the difference in the magnitude of the electromagnetic force F1 in the radial direction for each connection pattern in the three-phase coil 32 when two of the three-phase coils 32 are energized in the process of magnetizing the magnetic body 22. graph. That is, FIG. 29 is a graph showing the difference in the magnitude of the electromagnetic force F1 in the radial direction generated when magnetizing the magnetic body 22 by two-phase energization in the magnetizing process. The data shown in FIG. 29 are the results of electromagnetic field analysis.

In FIG. 29, the wiring pattern P3 corresponds to the wiring pattern shown in FIG. The connection patterns Ex2 and Ex3 are comparative examples. In the connection pattern Ex2, in the three-phase coil 32 connected by the Y connection, the external phase coil 323 is connected to the positive side of the power supply for magnetization, and the middle phase coil 322 is connected to the negative side of the power supply, One end of the inner phase coil 321 is an open end. In the connection pattern Ex3, among the three-phase coils 32 connected by Y connection, the middle phase coil 322 is connected to the positive side of the power supply for magnetization, and the inner phase coil 321 is connected to the negative side of the power supply. , one end of the inner phase coil 321 is an open end.

In the connection pattern Ex2, a large current flows from the magnetizing power supply to the external phase coil 323, and the electromagnetic force F1 generated in the external phase coil 323 is large. In this case, the external phase coil 323 is easily deformed in the radial direction. As a result, for example, when the electric motor 1 is applied to a compressor, the external phase coils 323 come close to metal parts (for example, the closed container of the compressor), making it difficult to ensure the electrical insulation of the external phase coils 323 .

On the other hand, in the connection patterns Ex3 and P3, the electromagnetic force F1 generated in the external phase coil 323 is smaller than that in the connection pattern Ex2. Therefore, when magnetization is performed with the rotor 2 arranged inside the stator 3, significant deformation of the three-phase coils 32, particularly the external-phase coils 323 can be prevented. As a result, deformation of the external phase coil 323 is suppressed, so that electrical insulation of the external phase coil 323 can be ensured.

FIG. 30 shows the difference in the magnitude of the electromagnetic force F2 in the axial direction for each connection pattern in the three-phase coil 32 when two of the three-phase coils 32 are energized in the process of magnetizing the magnetic body 22. graph. That is, FIG. 30 is a graph showing the difference in the magnitude of the electromagnetic force F2 in the axial direction generated when magnetizing the magnetic body 22 by two-phase energization in the magnetizing process. In FIG. 30, connection patterns Ex2, Ex3 and P3 correspond to connection patterns Ex2, Ex3 and P3 in FIG. 29, respectively.

As shown in FIG. 30, regarding the electromagnetic force F2 in the axial direction, two coils of the three-phase coils 32 generate a large electromagnetic force F2 in the axial direction regardless of the wiring pattern.

In the case of two-phase energization, in the process of magnetizing the magnetic body 22, considering the electromagnetic force F1 in the radial direction, it is desirable that the connection of the three-phase coil 32 be the connection pattern Ex3 or P3. In the connection pattern Ex3, the electromagnetic force F1 of the inner phase coil 321 is large, so in the case of two-phase energization, the connection of the three-phase coil 32 is preferably the connection pattern P3.

However, in the connection pattern Ex3 or P3, the electromagnetic force F2 of the first-phase coil connected to the positive side of the power supply for magnetization is large. In particular, the central portion of the first-phase coil, that is, the first region 35a, is likely to be greatly deformed.

Therefore, at each coil end 32a of each first-phase coil, more lacing material 34 is wound around the first region 35a than at least one of the second region 35b and the third region 35c. In other words, at each coil end 32a of each first phase coil, the density of the lacing material 34 in the first region 35a is the same as the density of the lacing material 34 in the second region 35b and the density of the lacing material 34 in the third region 35c. higher than at least one of the densities of In the wiring pattern Ex3, the first-phase coil is the middle-phase coil 322, and in the wiring pattern P3, the first-phase coil is the inner-phase coil 321.

As a result, the lacing material 34 can prevent significant deformation of the first-phase coil when magnetization is performed with the rotor 2 arranged inside the stator 3 in the connection pattern Ex3 or P3.

Therefore, since deformation of the three-phase coil 323 is suppressed, the performance of the electric motor 1, for example, the electrical insulation of the three-phase coil 32 can be ensured.

Furthermore, at each coil end 32a of each first-phase coil, the lacing material 34 should be wound more around the first region 35a than at least one of the second region 35b and the third region 35c. , the number of lacing materials 34 can be reduced, and the cost of the stator 3 can be reduced. Thereby, significant deformation of the three-phase coil 32 can be efficiently prevented.

The amount of varnish 36 adhering to the lacing material 34 in the first region 35a is the amount of varnish adhering to the lacing material 34 in the second region 35b and the amount of varnish adhering to the lacing material 34 in the third region 35c. at least one of the amounts of varnish applied. This enhances the holding power of the lacing material 34 in the first region 35a. As a result, the coils of each first phase can be firmly fixed, and the amount of varnish 36 on the stator 3 can be reduced compared to the prior art.

The characteristics shown in FIGS. 27 to 30 are also obtained when the three-phase coils 32 are connected by delta connection. Therefore, even when the three-phase coils 32 are connected by delta connection, when magnetization is performed with the rotor 2 arranged inside the stator 3, the lacing material 34 significantly deforms the first-phase coils. can be prevented. Therefore, since deformation of the three-phase coil 323 is suppressed, the performance of the electric motor 1, for example, the electrical insulation of the three-phase coil 32 can be ensured.

Even when the three-phase coils 32 are connected by delta connection, at each coil end 32a of each first-phase coil, the lacing material 34 is larger than at least one of the second region 35b and the third region 35c. The number of lacing materials 34 can be reduced, and the cost of the stator 3 can be reduced because it is sufficient that the lacing materials 34 are wound around the first region 35a. Thereby, significant deformation of the three-phase coil 32 can be efficiently prevented.

Even when the three-phase coil 32 is connected by delta connection, the amount of varnish 36 adhering to the lacing material 34 in the first region 35a is the same as the amount of varnish adhering to the lacing material 34 in the second region 35b. and the amount of varnish adhering to the lacing material 34 in the third region 35c. This enhances the holding power of the lacing material 34 in the first region 35a. As a result, the coils of each first phase can be firmly fixed, and the amount of varnish 36 on the stator 3 can be reduced compared to the prior art.

Embodiment 2.
A compressor 300 according to Embodiment 2 of the present invention will be described.
FIG. 31 is a cross-sectional view schematically showing the structure of compressor 300. As shown in FIG.

The compressor 300 has an electric motor 1 as an electric element, an airtight container 307 as a housing, and a compression mechanism 305 as a compression element (also referred to as a compression device). In this embodiment, compressor 300 is a scroll compressor. However, compressor 300 is not limited to a scroll compressor. Compressor 300 may be a compressor other than a scroll compressor, such as a rotary compressor.

Electric motor 1 in compressor 300 is electric motor 1 described in the first embodiment. Electric motor 1 drives compression mechanism 305 .

The compressor 300 further includes a subframe 308 that supports the lower end of the shaft 4 (that is, the end opposite to the compression mechanism 305 side).

The compression mechanism 305 is arranged inside the sealed container 307 . The compression mechanism 305 includes a fixed scroll 301 having a spiral portion, an orbiting scroll 302 having a spiral portion forming a compression chamber between the spiral portion of the fixed scroll 301 and a compliance frame 303 holding the upper end of the shaft 4 . and a guide frame 304 that is fixed to the sealed container 307 and holds the compliance frame 303 .

A suction pipe 310 that penetrates the closed container 307 is press-fitted into the fixed scroll 301 . Further, the sealed container 307 is provided with a discharge pipe 306 for discharging the high-pressure refrigerant gas discharged from the fixed scroll 301 to the outside. The discharge pipe 306 communicates with an opening provided between the compression mechanism 305 of the sealed container 307 and the electric motor 1 .

The electric motor 1 is fixed to the closed container 307 by fitting the stator 3 into the closed container 307 . The configuration of the electric motor 1 is as described above. A glass terminal 309 for supplying electric power to the electric motor 1 is fixed to the sealed container 307 by welding.

When the electric motor 1 rotates, the rotation is transmitted to the orbiting scroll 302, causing the orbiting scroll 302 to oscillate. When the orbiting scroll 302 oscillates, the volume of the compression chamber formed by the spiral portion of the orbiting scroll 302 and the spiral portion of the fixed scroll 301 changes. Refrigerant gas is sucked from suction pipe 310 , compressed, and discharged from discharge pipe 306 .

Since compressor 300 has electric motor 1 described in the first embodiment, it has the advantages described in the first embodiment.

Furthermore, since compressor 300 has electric motor 1 described in Embodiment 1, the performance of compressor 300 can be improved.

Embodiment 3.
A refrigerating and air-conditioning apparatus 7 as an air conditioner having a compressor 300 according to Embodiment 2 will be described.
FIG. 32 is a diagram schematically showing the configuration of a refrigerating and air-conditioning device 7 according to Embodiment 3. As shown in FIG.

The refrigerating and air-conditioning device 7 is capable of cooling and heating operation, for example. The refrigerant circuit diagram shown in FIG. 32 is an example of a refrigerant circuit diagram of an air conditioner capable of cooling operation.

A refrigerating and air-conditioning apparatus 7 according to Embodiment 3 has an outdoor unit 71 , an indoor unit 72 , and a refrigerant pipe 73 connecting the outdoor unit 71 and the indoor unit 72 .

The outdoor unit 71 has a compressor 300, a condenser 74 as a heat exchanger, an expansion device 75, and an outdoor fan 76 (first fan). Condenser 74 condenses the refrigerant compressed by compressor 300 . The expansion device 75 reduces the pressure of the refrigerant condensed by the condenser 74 and adjusts the flow rate of the refrigerant. The throttle device 75 is also called a decompression device.

The indoor unit 72 has an evaporator 77 as a heat exchanger and an indoor fan 78 (second fan). The evaporator 77 evaporates the refrigerant decompressed by the expansion device 75 to cool the indoor air.

The basic operation of the cooling operation of the refrigerating and air-conditioning device 7 will be described below. In cooling operation, refrigerant is compressed by compressor 300 and flows into condenser 74 . The refrigerant is condensed by the condenser 74 and the condensed refrigerant flows into the expansion device 75 . The refrigerant is depressurized by the throttle device 75 and the depressurized refrigerant flows into the evaporator 77 . The refrigerant evaporates in the evaporator 77 and the refrigerant (specifically, refrigerant gas) flows into the compressor 300 of the outdoor unit 71 again. When air is sent to the condenser 74 by the outdoor blower 76, heat is transferred between the refrigerant and the air. Similarly, when air is sent to the evaporator 77 by the indoor blower 78, heat is transferred between the refrigerant and the air. Moving.

The configuration and operation of the refrigerating and air-conditioning device 7 described above are examples, and are not limited to the above-described example.

The refrigerating and air-conditioning apparatus 7 according to the third embodiment has the advantages described in the first and second embodiments.

Furthermore, since the refrigerating and air-conditioning apparatus 7 according to Embodiment 3 has the compressor 300 according to Embodiment 2, the performance of the refrigerating and air-conditioning apparatus 7 can be improved.

The features of each embodiment and the features of each modified example described above can be appropriately combined with each other.

1 electric motor 2 rotor 3 stator 7 refrigerating air conditioner 31 stator core 32 three-phase coil 32a coil end 34 racing material 35a first region 35b second region 35c third Area 36 Varnish 71 Outdoor unit 72 Indoor unit 300 Compressor 305 Compression mechanism 307 Closed vessel 74 Condenser 77 Evaporator 321 Internal phase coil 322 Intermediate phase coil 323 External phase coil.

Claims (15)

A stator capable of magnetizing the magnetic material of the rotor,
a stator core;
A three-phase coil attached to the stator core by distributed winding and having a first-phase coil, a second-phase coil, and a third-phase coil;
and a lacing material wound around the three-phase coil,
The first-phase coil is a coil through which the largest current flows among the three-phase coils when current flows from the power source for magnetizing the magnetic material to the three-phase coil,
At the coil ends of the three-phase coil, the first-phase coil has a first region, a second region, and a third region that are evenly divided,
The first region is located between the second region and the third region,
The lacing material is wound around the first region more than at least one of the second region and the third region. A stator. In the coil end, the second phase coil, the first phase coil, and the third phase coil are arranged in this order in the circumferential direction of the stator core,
In the coil end, the second phase coil, the first phase coil, and the third phase coil are arranged in this order from the inner side of the stator core in the radial direction of the stator core. Item 1. The stator according to item 1. In the coil end, the first phase coil, the second phase coil, and the third phase coil are arranged in this order in the circumferential direction of the stator core,
In the coil end, the first phase coil, the second phase coil, and the third phase coil are arranged in this order from the inner side of the stator core in the radial direction of the stator core. Item 1. The stator according to item 1. At the coil end of the three-phase coil, the second-phase coil has a first region, a second region, and a third region that are evenly divided,
the first region of the second-phase coil is located between the second region of the second-phase coil and the third region of the second-phase coil;
At the coil ends of the three-phase coil, the third-phase coil has a first area, a second area, and a third area that are evenly divided,
the first region of the third-phase coil is located between the second region of the third-phase coil and the third region of the third-phase coil;
The first-phase coil is a coil through which the largest current flows among the three-phase coils when current flows from the power source for magnetizing the magnetic material to the three-phase coil,
In the coil end of the three-phase coil, the density of the lacing material in the first region of the first-phase coil is equal to the density of the lacing material in the first region of the second-phase coil and the third phase coil. 4. A stator according to any one of claims 1 to 3, wherein each of the lacing material densities in the first region of the coil is higher than each. In the coil end, the first phase coil, the third phase coil, and the second phase coil are arranged in this order in the circumferential direction of the stator core,
In the coil end, the first phase coil, the third phase coil, and the second phase coil are arranged in this order from the inner side of the stator core in the radial direction of the stator core. Item 1. The stator according to item 1. At the coil end of the three-phase coil, the second-phase coil has a first region, a second region, and a third region that are evenly divided,
the first region of the second-phase coil is located between the second region of the second-phase coil and the third region of the second-phase coil;
At the coil ends of the three-phase coil, the third-phase coil has a first area, a second area, and a third area that are evenly divided,
the first region of the third-phase coil is located between the second region of the third-phase coil and the third region of the third-phase coil;
The first-phase coil and the second-phase coil are coils through which the largest current flows among the three-phase coils when current flows from the power source for magnetizing the magnetic body to the three-phase coil. can be,
The density of the lacing material in the first region of the first-phase coil is higher than the density of the lacing material in the first region of the third-phase coil, and the density of the lacing material in the first region of the second-phase coil is higher. The stator according to claim 1 or 5, wherein the density of the lacing material in a region is higher than the density of the lacing material in the first region of the third phase coil. In the coil end, the third phase coil, the second phase coil, and the first phase coil are arranged in this order in the circumferential direction of the stator core,
In the coil end, the third phase coil, the second phase coil, and the first phase coil are arranged in this order from the inner side of the stator core in the radial direction of the stator core. Item 1. The stator according to item 1. At the coil end of the three-phase coil, the second-phase coil has a first region, a second region, and a third region that are evenly divided,
the first region of the second-phase coil is located between the second region of the second-phase coil and the third region of the second-phase coil;
At the coil ends of the three-phase coil, the third-phase coil has a first area, a second area, and a third area that are evenly divided,
the first region of the third-phase coil is located between the second region of the third-phase coil and the third region of the third-phase coil;
The first-phase coil is a coil through which the largest current flows among the three-phase coils when current flows from the power source for magnetizing the magnetic material to the three-phase coil,
In the coil end of the three-phase coil, the density of the lacing material in the first region of the first-phase coil is equal to the density of the lacing material in the first region of the second-phase coil and the third phase coil. 8. A stator according to claim 1 or 7, wherein each of the lacing material densities in the first region of the coils of . The stator according to any one of claims 1 to 8, wherein the first phase coil, the second phase coil, and the third phase coil are connected by a Y connection. The stator according to any one of claims 1 to 8, wherein the first phase coil, the second phase coil, and the third phase coil are connected by delta connection. A stator according to any one of claims 1 to 10;
and the rotor arranged inside the stator. a closed container;
a compression device disposed within the closed vessel;
and the electric motor of claim 11 for driving the compression device. a compressor according to claim 12;
An air conditioner comprising a heat exchanger and A method for manufacturing a stator having a stator core and three-phase coils attached to the stator core by distributed winding and having a first-phase coil, a second-phase coil, and a third-phase coil There is
At the coil ends of the three-phase coil, the first-phase coil has a first region, a second region, and a third region that are evenly divided,
The first region is located between the second region and the third region,
attaching the three-phase coil to the stator core by distributed winding;
Winding more lacing material around the first region than at least one of the second region and the third region at coil ends of the first phase coil. . Inside a stator having a stator core and three-phase coils attached to the stator core with distributed windings and having a first phase coil, a second phase coil, and a third phase coil, A magnetization method for magnetizing a magnetic body of a rotor,
At the coil ends of the three-phase coil, the first-phase coil has a first region, a second region, and a third region that are evenly divided,
The first region is located between the second region and the third region,
At the coil end of the first phase coil, more lacing material is wound around the first region than at least one of the second region and the third region ,
arranging a rotor having the magnetic material inside the stator;
A magnetizing method comprising: supplying a current from a power source for magnetizing the magnetic material to the three-phase coil so that the largest current flows through the first-phase coil.

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